Scientists think that an itchy feeling is a mechanism to protect us from harmful external physical elements like parasites and chemicals. The irritating feeling reflexively prompts us to scratch it, which may help to remove the irritant, providing some protection.
However, sometimes, the itchy feeling results from an internal source. An external response to something irritating from within. In such cases, the medical world seeks to help us find the source of that irritant because that itchy feeling may be an indicator of something more harmful and foreboding within. Something that, if left unattended, can lead to bigger problems.
Life experience generates a wisdom that youthful naivety can easily miss. Having gone through the shit, seen some things with your own eyes, and been at the receiving end, you start to get a feel for when stuff might go down.
You get that itchy feeling.
Always listen to that itchy feeling.
